Commutator



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Patented June 15, 1943 COMMUTATOR Lawrence F. Hemphill, Fort Wayne, Ind., assignor to General Electric Company, a corporation of New York Application October 6, 1942, Serial No. 460,937 7 Claims. (Cl. 171-321) My invention relates to commutators for dynamo-electric machines.

An object of my invention is to provide improved and simplified commutator constructions.

Further objects and advantages of my invention will become apparent and my invention will be better understood from the following description referring to the accompanying drawing, and the features of novelty which characterize my invention will be pointed out with particularity in the claims annexed to and forming part of this specification.

In the drawing, Fig. l is a side elevational view, partly broken away, illustrating an embodiment of my invention; Fig. 2 is an end view, partly broken away, of the commutator shown in Fig. 1; Fig. 3 is a perspective view of the clamping ring shown in Figs. 1 and 2; Fig. 4 is a perspective view of the insulating support shown in Figs. 1 and 2; and Fig. 5 is a side elevational view of a commutator segment such as that shown in Figs. 1 and 2.

Referring to the drawing, I have shown in Figs. 1 to 5 a simplified commutator construction comprising a plurality of commutator segments formed of two sections l and II. These commutator bars are mounted on an insulating sleeve support l2 mounted on a shaft l3. The sleeve is provided with an insulating supporting shoulder element l4 extending outwardly at an angle to the sleeve, and a plurality of circumferentially spaced apart grooves I is formed in the axially extending sleeve portion 12 and shoulder It. The commutator segments are formed prior to assembly, as shown in solid lines in Fig. 5, with the portions ii extending outwardly at an angle Hi to the portions I 0 greater than the angle of the shoulder id relative to the sleeve l2; that is, the angle it between the commutator segment portions l0 and H is greater than the angle ll between the portions of the groove l5 in the insulating sleeve l2'and the shoulder M. The commutator segments are arranged on the insulating support with the segment portions l0 extending axially in the grooves 15 formed inthe sleeve l2 and with the segment angular portions H arranged in the grooves l5 in the shoulder It. A clamping rin N3 of insulating material is ar ranged over the segment portions l0 and engages the outwardly extending segment angular portions H and biases them into engagement with the grooves IS in the shoulder l4 to a position as indicated by the dotted lines in Fig. 5, thereby biasing the segment axial portions I0 firmly against the insulating support l2. The sleeve i8 plurality of clampin fingers l9 which is formed with inturned ends 20 arranged over the outer edge of the shoulder I4 and between adjacent segment angular portions I I in order to clamp the ring in position. The inturned ends 20 of the clamping fingers is are formed on a smaller diameter than the outer diameter of the shoulder l4, and in assembling the commutator, the ring I8 is snapped into position and the inturned ends of the fingers [9 are clamped over the outer edge of the shoulder l4 and retain the commutator in assembled relationship.

While I have illustrated and described a particular embodiment of my invention, modifications thereof will occur to those skilled in the art. I desire it to be understood, invention is not to be limited to the particular arrangement disclosed, and I intend in the appended claims to cover allmodifications which do not depart from the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A commutator including an insulating sleeve support, an insulating element on said support extending outwardly at an angle thereto, a plurality of commutator segments having a portion of each extending axially and substantially parallel to each other-on said sleeve support in spaced apart relationship and a portion of each formed at an angle to said axial portion, and means including a clamping ring for securing said segment angular portions clamped at an outwardly extending angle against said angular insulating element for biasin said segment axial portions firmly against said sleeve support.

2. A commutator including an insulating support having a shoulder thereon extending outwardly at an angle, a plurality of commutator segments having a portion of each extending is provided with axially and substantially parallel to each other on said support in spaced apart relationship and a portion of each formed at an angle to said axial portion, and means including a clamping ring for securing said segments on said support with said segment angular portions clamped against said shoulder at an outwardly extending angle.

3. A commutator including an insulating support having a shoulder thereon extending outwardly at an angle, a plurality of commutator segments having a portion of each extending axially and substantially parallel to each other on said support in spaced apart relationship and therefore, that my a portion of each formed prior to assembly at a greater angle to' said axial portion than said angle of said shoulder on said support, and means at a greater angle to said axially extending portion than said angle of said shoulder on said 'support, and means including a clamping ring for securing said segment angular portions clamped against said shoulder.

5. A commutator including an insulating sleeve support having a shoulder thereon extending outwardly at an angle, a plurality of spaced apart grooves in said sleeve and shoulder, a plurality oi commutator segments having a portion of v each extending axially in said grooves in said support and a portion of each formed prior to assembly at a greater angle to said axial portion than said angle of said shoulder on said support, and means for securing said segments on said support with said segment angular portions clamped against said shoulder and biased to substantially the same angle as said shoulder for biasing said segment axial portions firmly against said support.

' A a portion of each formed prior to assembly at a greater angle to said axial portion than said angle of said shoulder on said support, and means including a clamping ring for securing said segments on said support with said segment angular portions clamped against said shoulder and biased to substantially the same'angle to said axial portion as said shoulder relative to said support for biasing said segment axial portions firmly against said support.

7. A commutator including an insulating support having a shoulder thereon extending outwardly at an angle, a plurality of commutator segments having a portion of each extending axially and substantially parallel to each other on said support and a portion of each formed prior to assembly at a greater angle to said axial portion than said angle of said shoulder on said support, and means including a clamping ring provided with fingers arranged between said segment angular portions and clamped about said shoulder for securing said segments on said support with said segment angular portions clamped against said shoulder andbiased to substantially the same angle to said axial portion as said shoulder relative to said support for biasing said segment axial portions firmly against said support.

LAWRENCE F. HEMPHILL. 

